One-piece rat guard



Patented Jan. Y2s. 1930 e FREDERICK E. MAYNARROF LOS ANGELES, CALIFORNIA ONE-PIECE RAT GUARD Application filed August 18, 1925. Serial N'o. 50,939.

This invention relates ships h Y Y rodents from passing to or from dock or ship.

I Inited States regulations, to be durable and i rigid must beof stiff metal, unless Well braced. An object of my present invention is to provide for use of stift metal and eliminate braces, and at the saIne time provide a guard at low cost, which is an important item, considering that rat guards are special equipment bought and vused onlyunder compulsion by ship people.

An object is to provide a knock-down guard. An object of this invention is to obtain utmost simplicity, fewest possible pieces, and minimum cost of manufacture.

he invention consists of the improved guard and a method of making it.

'20 lgure 1 is a perspective of the guard on a line.

Figure 2 is a plan of the plate blank. Figure 3 is a plan of a portion of the slit 2f plate. f

' 0 Figure 4 is a crossfsection of a finished plate.

Figure 5 is shutter blank. f

Figure 6 is an edge View of Figure `5.

Figure 7 is a plan of a sleeve blank.

Figure Skis a front elevation of an open guard. v Y

The cost of cutting a.l 36 inch disc from al piece of or #22 iron is considerable and an object is to eliminate this cost. 1

he guard includes an octagonal plate 3 cut from a square blank 2. at t,l and also at 5 to form tongues 6 by bending up the points formed after the slits 5 a plan of a portion of the slit *.4 are made. The tongues are perforated at 7 for bolts. The metal along the slit 4, to the center of the disc, is folded back flat at 8 on the disc. The sharp points of the horns 5 may be cut ofl`l as they might stick in or cut a fiber or hemp rope.

To hold the plate 3 perpendicular to 'a hawser a split sleeve is bolted to it to project from one side. This sleeve is made of duplicate sheet members 9. One end is slotted to form fingers 10 and along the opposite end store and sh This I radially slit around the perimeter are holes 11 so spaced that when the member g 1s bent to half-round form, the holes 11 will register With the holes`7 of the up-bent tongues 6 of the plate 3, so that a sleeve member can be attached' by bolts 12 to the plate 3.

pair of the sleeve members 9 is connected along one edge by common butt hinges7 13 which are preferably riveted on.

When the lips of the slit 4 are folded back there is thus formed a slot 14 for the entrance of any size haWser up to the Width ofthe slot.

To close this slota shutter is made of a fiat blank 15 of sheet metal. Thisvis radiallyV slit at 16 to form tongues 17 at the center of one end; the blank beingy so long that one end can be folded as a hook 18 over the edge ofthe plate 3.'

One member of the sleeve kis riveted `or bolted around the tongues 17 of the shutter 15.

In knockedv down condition, a large number other; v

To pack the sleeves these are openedon their hinges 13 and laid tunnel-like, then others are stacked from bottom up; the shuttersl 15 standing close Vin a row back to back. v

This feature ofk packing in knocked-down condition is important bothi ip space, and for permitting' a number to be crated in transportation.

races are completely eliminatedby bendover very narroiv (M1 inch) laps 20 all ofthe plate 3.

Whole plate.

ing

effectively stiifens the `What is claimed is:

1. In a rat guard, a member formed ofa blank havinga slit radial to a center point, and having radial slits from said point to form triangular tongues bendable to stand in an are.

2. In a rat guard, a member blank having slits radial from formed of a a pointr 1n its for conserving Vso compact conditionjfor' Thisv and forming a center to form tongues bendable to stand in an arc.

3. In a rat guard, a slotted plate part and a shutter part to close the slot, the parts having integral fastening tongues, in a circle, when the shutter is closed, and half sleeves overlapped on and secured to respective groups of the tongues en the parts; the halt sleeves being hinged together'.

4. A-knocl-doivn rat guard including a pair of hinged, half-round sleeve members forming a cylinder, a shutter to which one end of one sleeve member is attached, all said parts forming a unit, and plate having triangular tongues turned out to form a semieircular hole and to which the other 1nember is boltable to complete the guard.

5. A rat guard having a plate adapted to substantially encompass a support and having a radial slot to its rim, a set of tongues, integral with the plate, in a semicircle at the inner end of the slot and bent perpendicular to the plate, a half-sleeve secured on the tongues, and a slot shutter pivotally related to the plate and having a half-sleeve matching the opposite half-sleeve.

G. A rat guard including a plate having a adial slot, with a halt-round inner end, a slot shutter pivotally related to the plate and having a half-round recess in its inner end, sets of tongues bent to stand unidirectionally from the plate and the shutter, and halfsleeves secured to the set of lugs on the shutter and the plate to form a rope sleeve.

7,. A rat guard including a plate having a radial slot, a semicircle ot tongues bent out from the plate around the inner end of the slot, a slot shutter having on its inner end a semicircular set of tongues bent therefrom and forming a half-'round recess, and a pair of hal-sleeves hingedV along one side and connected to respective sets of lugs, whereby to pivotally relate the plate and shutter.

S. A rat guard including a plate having a radial slot, a semicircle of tongues bent out from the plate around the inner end of the slot, a slot shutter having on its inner end a semicircular set of tongues bent therefrom half-round recess, and a pair of half-sleeves hinged along one side and detachably connected to respective sets ot lugs, whereby to pivotally relate the plate and shutter.

9. The steps in the making of a rat guard, which consist of radially slitting its guard members to form, in each, a set of radial tongues, then bending the tongues out perpendicularly to the respective members so as to stand in a semicircle.

10. The steps in the making of a' rat guard, which consist of radially slitting its guard members to form, in each, a set of radial tongues, then bending the tongues out perpendicularly to the respective members so as to stand in a semieircle; the tongues being perforated, for rivets or bolts, at any time before they are bent up.

11. The steps in the making of a rat guard, which consists of radially slitting its guard members to form, in each, a set ot radial tongues, then bending the tongues out perpendicularly to the respective members so as to stand in a semicircle, and perforating and shaping sleeve blanks to fit the sets ot tongues, and securing them thereto.

FREDERICK E. MAYNARD. 

